# GUARDIAN INVESTMENT MANAGEMENT, LLC

GUARDIAN INVESTMENT MANAGEMENT, LLC of TIBURON, CA is an SEC-registered investment adviser.

## Registration

- CRD: 104935
- Type: SEC-registered investment adviser
- SEC file number: 801-11279
- Location: 1120 MAR WEST ST., SUITE D, TIBURON, CA, 94920
- Phone: 415-765-6860
- Latest filing: 2026-03-06
- Regulatory AUM: $310.3M
- Discretionary AUM: $263.7M
- Non-discretionary AUM: $46.6M
- Accounts: 127

## Business model

- Compensation: % of AUM, Fixed
- Clients served: High net worth, Pooled vehicles

## Officers, owners & control persons (7)

| Name | Role | Location |
| --- | --- | --- |
| Robert Michael Tomasello | PRESIDENT, MANAGING MEMBER, CCO | — |
| Donald Louis Hansen | PARTNER | — |
| ZUCK MATTHEW DEAN | PARTNER | — |
| ETHRIDGE STEPHEN ARTHUR | MEMBER, CHIEF COMPLIANCE OFFICER; PARTNER, CHIEF COMPLIANCE OFFICER; PRINCIPAL, CHIEF COMPLIANCE OFFICER | — |
| TOMASELLO ROBERT MICHAEL | CEO,CCO; CEO,CHIEF COMPLIANCE OFFICER; MANAGING PARTNER (+2 more) | — |
| HANSEN DONALD LOUIS | MEMBER, SENIOR PORTFOLIO MANAGER; PARTNER; PRINCIPAL (+1 more) | — |
| Denise Louise Doley | PARTNER | — |


## Related pages

- Form ADV Part 2 brochure: https://search.stillhousedata.com/firm/104935/brochure
- Similar advisers: https://search.stillhousedata.com/firm/104935/similar
- Related entities: https://search.stillhousedata.com/firm/104935/related
- SEC IAPD (source of record): https://adviserinfo.sec.gov/firm/summary/104935

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Source: public SEC Form ADV data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.